Steam-engine.



G. W. BAKER.

STEAM ENGINE. I APPLICATION FILED MAY 23, 1910.

Witnesses "I Attorneys M H s a i. 1 I

G. W. BAKER.

STEAM ENGINE. APPLICATION-FILED MAY 23, 1910.

987,035. Patented Mar.14,1911.

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STEAM-ENGINE.

Specification of Letters Patent.

Patented Mar. 14:, 1911.

Application filed May 23, 1910. Serial No. 562,901,

To all whom it may concern:

Be it known that I, GEORGE W. BAKER, a citizen of the United States,residing at Denver, in the county-of Denver and State of Colorado, haveinvented a new and useful SteamEngine, of which the following is aspecification.

This invention has relation to improvements in steam engines of thegeneral type disclosed in my former application No. 524,575, filedDecember 23, 1909; and it relates more particularly to exhaust valvemechanism and to the supplemental valves thereof, improved means beingprovided for adjusting the tension of the springs which hold said valvesseated.

With these and other objects in View as will appear when the nature ofthe invention is better understood, the same consists of the novelconstruction and arrangement of the parts to be hereinafter describedand claimed, reference being had to the accompanying drawings forming apart of this specification, in which:

Figure 1 is a side elevation of the engine. Fig. 2 is a horizontalsection taken through the cylinder. Fig. 3 is a transverse section ontheline 3-3 of Fig. 2. Fig. 1 is a perspective view of the shiftinglink. Fig. 5 is a transverse section on the line 5-5 of Fig. 4.

In the drawings, 1 denotes the cylinder, in the bore 2 of which a piston3 reciprocates. The cylinder is closed at its ends by heads 4 providedwith suitable stufling boxes. Through the stufiing box of one cylinderhead passes a stem 5 extending from one side of the piston, said stemservino' merely as a guide. From the other side of the piston extends apiston rod 6 which passes through the stufiing box on the other cylinderhead and is connected to a cross head 7 sliding in guides formed on theengine bed. The crank 011 the engine shaft 8 is connected to the crosshead by a connecting rod 9. The steam inlet ports of the cylinder areindicated at 10, said ports opening into the bore of the cylinder at therespective ends thereof. Valves 11 of the Corliss type control theseports, said valves being operated from eccentrics 12 on the engine shaftthrough a shifting link 13 connected by rods 14 to the respectiveeccentrics. In the slot of the link operates a block to which isconnected a rocker arm 15 fulcrumed on the engine bed at 15. One

end of this arm is connected to the link block, and the other end isconnected to the valve actuating rod 16.

The link 13 is of skeleton form and comprises two spaced members 17,said members being held in spaced relation by spacing blocks 18therebetween at the ends. Bolts or other suitable fastening meanspassing through the members and through the spacing blocks securelyfasten the parts together. These members have alined slots 19 which arearcuate as usual. The link block is indicated at 21. This block islocated between the two spaced members 17 and carries an axle 22 onwhich are journaled rollers 23 which work in the slots 19.

The link block overlaps the members 17 sutliciently to hold the rollersin place within the slots. To one end of the axle 22 is connected therocker arm 15. The link members are also provided with cars at to whichthe eccentric rods 16L are connected. Intermediate its ends, the linkcarries a stirrup 25 to which the link shifting mechanism is connected.Said mechanism comprises a bell crank lever 26 fulcrumed on the enginebed, and having one of its branches connected by a link 27 to thestirrup 25. The other arm of the bell crank lever is connected by arod28 to a hand lever 29 fulcrumed on the engine bed, or at any othersuitable and convenient location. A toothed quadrant 30 is provided, andthe hand lever has the usual spring latch 31 engageable therewith,whereby the lever is locked, and the shifting link thus held in adjustedposition.

Leading from the bore of the cylinder 1, is a circular series of exhaustports 32 which open into exhaust cavities 33 formed in the cylinder wallat the top and bottom thereof in order to constitute an ample exhaustpassage. The exhaust cavities open at one end through one side of thecylinder wall and over said ends is mounted a casing 3st into which theexhaust is discharged, said casing having an outlet 35. The exhaustcavities 33 are formed with cylindrical portions 36 in which operaterotary valves 37 controlling the escape of the exhaust, the valves eachbeing provided with a by-pass 37 to permit the exhaust steam todischarge into the casing 34. Each valve terminates at one of its endsin a circular valve seat 38 which is engaged by a valve 39 held seatedby a coiled spring 410 engaging the back of the cylinder 1, and is madesolid at this end so that packing rings 42 may be applied there-.

to. ()n' the outer end of this portion of the valve fits a plate 43which is bolted or otherwise secured to the cylinder wall. Through thisplate passes a sleeve 44 extending axially from the valve, and throughsaid sleeve passes a rod 45, said rod extending longitudinally through acentral opening in the valve 87 and also. passing through an openingmade in the valve 39, on the outside of which it is connected to theouter end of the spring 40, this rod being provided for the purpose ofadjusting the tension of said spring.

The two exhaust valves 37 are adapted to 'be set simultaneously by meansof a hand lever 45 fulcrumed on the engine bed or at any other suitableplace, said lever being connected by a rod 46 to a rocker arm 47connected to the lower valve stem 44. A sec- 0nd rocker arm 48 iscarried by this valve stem, and said second mentioned rocker arm isconnected by a link 49 to a rocker arm 50 connected to the stem of theupper exhaust valve 37, whereby both valves are operated simultaneouslywhen the lever 45 is swung. A toothed quadrant 5-1 engageable by aspring latch 52, carried by the hand lever, is provided for locking thelatter in adjusted position. The valve stems are provided with suitablestufiing boxes.

To the outer end of the rod 45 is fastened a knuckle 53 to which isconnected the outer end of a horizontal rocker arm 54 carried byandextending from a vertical rock shaft 55 mounted in bearings 56carried by the cylinder wall 1. A second rocker arm 57 is connectedtothe rod 45 of the other exhaust valve- From the shaft 55 extends a thirdrocker arm 58 which is connected by a rod 59 to a hand lever 60fulcrumed on the engine bed or atany other suitable location.

This hand lever also carries a spring latch 61 adapted .to engage atoothed quadrant 62 for the purpose of locking the lever.

The hereindescribed connections between the hand lever 60 and the rods45 are provided for the purpose of moving said rods in the direction oftheir length for the purpose of adjusting the tension of the sprmgs 40.In operation, the lever 60 regulates the lead of the engine when runningat a high speed. To reverse, the link 13 is shifted by the hand lever29, the exhaust valve being moved to closed position by the lever 45.Through the lever 60 the springs 40 may be adjusted to give more lead,and steam will not be admitted until the piston is at the center, andthen steam will be admitted to the cylinder on the end of the stroke,the excess of motive fluid being exhausted through the valves 39, whenthe pressure thereof exceeds the tension of the springs 40. Forinstance, if the springs are set to resist a pressure of 40 pounds, thesteam in the cylinder may escape when it is in excess of this pressurebut when the steam pressure is reduced to or below this pressure it istrapped in the cylinder and compressed in the cylinder upon the returnstroke of the piston.

What is claimed is In combination with an engine including a cylinderhaving a piston mounted for reciprocation therein,said cylinder havingan induction port at one end of the piston stroke and an exhaust port atthe other end of the piston stroke; a manually operable valve forcontrolling the exhaust port, and having a bypass and a spring pressedvalve mounted upon the exhaust valve and normally closing the bypassthereof, the tension of said spring being opposed to pressure from thecylinder, and a manually operable means for varying the tension of saidspring.

In testimony thatI claim the foregoing as my own, I have hereto afiixedmy signature in the presence of two witnesses.

GEORGE W. BAKER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

- Washington, D. G.

